Low Concentrations of Salicylic Acid Stimulate Insect Elicitor Responses in <Emphasis Type="Italic">Zea mays</Emphasis> Seedlings |
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Authors: | Jurgen Engelberth Sriram Viswanathan Marie Jeanette Engelberth |
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Affiliation: | (1) Department Biology, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA |
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Abstract: | Salicylic acid (SA) generally is thought to suppress jasmonic acid (JA) related signaling events. However, when we treated
the roots of corn seedlings overnight with low physiological concentrations of SA (50 μM), we found a priming effect of this
pretreatment on typical insect elicitor (IE)-induced responses in the leaves of these plants. IE-induced JA was more than
2-fold up regulated in SA-pretreated plants. Consequently, IE-induced volatile organic compounds (VOC) release also was significantly
increased. In contrast, when corn seedlings were treated with SA overnight and then mechanically damaged, we found no significant
differences in JA accumulation. We also found that the application of even lower concentrations of SA (5 μM) had no significant
effect on IE-induced responses, while higher concentrations (500 μM) inhibited IE-induced JA accumulation. Likewise, shorter
exposure to SA did not affect subsequent JA accumulation induced by IE or mechanical wounding. These results provide evidence
for the existence of non-compatible defense priming by signaling molecules that usually are involved in a conflictive defense
signaling pathway and suggests common elements in the regulation of priming plant defense responses. |
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